?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=PENGARUH+TEMPERATUR+ARTIFICIAL+AGING%0D%0ATERHADAP+SIFAT+KEKERASAN+DAN%0D%0ASTRUKTUR+MIKRO+Al-2024&rft.creator=Okta+Rianda%2C+1615021012&rft.subject=600+Teknologi+(ilmu+terapan)&rft.description=Penelitian+ini+bertujuan+untuk+mengetahui+pengaruh+temperatur+artificial+aging%0D%0Aterhadap+sifat+kekerasan+dan+struktur+mikro+Al-2024.+Penelitian+ini+menggunakan%0D%0Aspesimen+berupa+Aluminium+seri+2024+yang+diberi+perlakuan+panas+dengan+suhu%0D%0A4500C+selama+15+menit%2C+kemudian+di+quenching+dengan+media+pendingin+berupa%0D%0Aair.+Selanjutnya+diberi+perlakuan+panas+kembali+dengan+variasi+temeratur+yakni%0D%0A150%0D%0A0C%2C+170%0D%0A0C+dan+190%0D%0A%0D%0A0C+dengan+holding+time+selama+5+jam.+Kemudian+spesimen%0D%0A%0D%0Adidinginkan+secara+lambat+dengan+suhu+ruangan.%0D%0AHasil+uji+komposisi+kimia+menggunakan+Spectromax+menunjukan+persentase+Al%0D%0Asebesar+90%2C6%25+dan+Cu+sebesar+5%2C90%25.+Hasil+uji+kekerasan+menggunakan+Rockwell%0D%0AHardness+Tester+didapatkan+nilai+kekerasan+tanpa+perlakuan+panas+yang+memiliki%0D%0Anilai+kekerasan+sebesar+60%2C2+(HRB)%2C+nilai+kekerasan+setelah+diquenching+sebesar%0D%0A54%2C1+(HRB).+Nilai+kekerasan+tertinggi+terdapat+pada+pemanasan+dengan+variasi%0D%0Atemperatur+pada+1900C+dengan+nilai+kekerasan+sebesar+74%2C4+(HRB)+dimana+nilai%0D%0Akekerasan+pada+temperatur+1900C+mengalami+peningkatan+sebesar+23%2C59%25+dari%0D%0Anilai+kekerasan+bahan+tanpa+perlakuan+panas.+Pengujian+struktur+mikro+didapatkan%0D%0Ahasil+material+Al-Cu+setelah+proses+artificial+aging+pada+temperatur+1900+C%0D%0Amemiliki+fase+%CE%B8+dengan+jumlah+yang+lebih+banyak+dan+batas+butir+Al-Cu+cenderung%0D%0Alebih+rapat+dan+teratur.+Hal+ini+berarti+bahwa+pada+bahan+yang+mendapat+perlakuan%0D%0Aartificial+aging+terdapat+endapan+presipitat+atau+terbentuknya+fasa+kedua+yang%0D%0Amenjadi+penyebab+bahan+tersebut+lebih+keras+dan+lebih+baik+sifat+mekanisnya.%0D%0A%0D%0AKata+Kunnci%3A+aluminium+2024%2C+artificial+aging%2C+nilai+kekerasan+dan+struktur+mikro.+This+study+aims+to+determine+the+effect+of+artificial+aging+temperature+on+the%0D%0Ahardness+and+microstructure+of+Al-2024.+This+study+used+a+specimen+in+the+form+of%0D%0AAluminum+2024+series+which+was+heat+treated+with+a+temperature+of+4500C+for+15%0D%0Aminutes%2C+then+quenched+with+a+cooling+medium+in+the+form+of+water.+Subsequently%2C%0D%0Athey+were+reheated+with+variations+in+temperature%2C+namely+1500C%2C+1700C+and%0D%0A1900C+with+a+holding+time+of+5+hours.+Then+the+specimen+is+slowly+cooled+to+room%0D%0Atemperature.%0D%0A%0D%0AThe+results+of+the+chemical+composition+test+using+Spectromax+showed+the%0D%0Apercentage+of+Al+was+90.6%25+and+Cu+was+5.90%25.+The+results+of+the+hardness+test%0D%0Ausing+the+Rockwell+Hardness+Tester+obtained+a+hardness+value+without+heat%0D%0Atreatment+which+has+a+hardness+value+of+60.2+(HRB)%2C+a+hardness+value+after%0D%0Aquenching+of+54.1+(HRB).+The+highest+hardness+value+is+found+in+heating+with%0D%0Atemperature+variations+at+1900C+with+a+hardness+value+of+74.4+(HRB)+where+the%0D%0Ahardness+value+at+1900C+has+an+increase+of+23.59%25+from+the+hardness+value+of+the%0D%0Amaterial+without+heat+treatment.+Microstructure+testing+showed+that+the+Al-Cu%0D%0Amaterial+after+the+artificial+aging+process+at+a+temperature+of+1900+C+had+a+higher%0D%0Anumber+of+phases+and+the+Al-Cu+grain+boundaries+tended+to+be+more+dense+and%0D%0Aregular.+This+means+that+the+material+that+has+been+treated+with+artificial+aging+has%0D%0Aprecipitated+deposits+or+the+formation+of+a+second+phase+which+causes+the+material%0D%0Ato+be+harder+and+have+better+mechanical+properties.&rft.publisher=FAKULTAS+TEHNIK+&rft.date=2021&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F60173%2F1%2F1.%2520ABSTRAK-ABSTRACT%2520-%2520Okta%2520Rianda.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F60173%2F2%2F2.%2520%2520SKRIPSI%2520FULL.%2520-%2520Okta%2520Rianda.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F60173%2F3%2F3.%2520SKRIPSI%2520TANPA%2520BAB%2520PEMBAHASAN.%2520-%2520Okta%2520Rianda.pdf&rft.identifier=++Okta+Rianda%2C+1615021012++(2021)+PENGARUH+TEMPERATUR+ARTIFICIAL+AGING+TERHADAP+SIFAT+KEKERASAN+DAN+STRUKTUR+MIKRO+Al-2024.++FAKULTAS+TEHNIK+%2C+UNIVERSITAS+LAMPUNG.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F60173%2F